In particular, recognize builtins' values accesses and direct accesses
to external reference values. For example:

  REX.W leaq rax,[r13+0x47a0]
  REX.W leaq rbx,[r13+0x80b0]

turns into

  REX.W leaq rax,[r13+0x47a0] (builtin (RecordWrite))
  REX.W leaq rbx,[r13+0x80b0] (external value (Isolate::context_address))

Bug: v8:8238
Change-Id: I3b049a1e82de7450bf04135c0c8d76b4dca4ee10
Reviewed-on: https://chromium-review.googlesource.com/c/1256830Reviewed-by: Michael Starzinger <mstarzinger@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Commit-Queue: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56355}